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provide a simple gb_file_copy() implementation

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permit to not require sendfile(2) syscall for gb_file_copy()
This commit is contained in:
Sébastien Marie
2022-02-25 12:32:34 +00:00
parent 00c138ce9f
commit 0a90994403
1 changed files with 44 additions and 4 deletions
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src/gb/gb.h
+44 -4
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@@ -243,9 +243,6 @@ extern "C" {
#include <stdio.h>
#include <pthread_np.h>
#define lseek64 lseek
// XXX OpenBSD
#define sendfile(out, in, offset, count) (-1)
#endif
#if defined(GB_SYSTEM_UNIX)
@@ -6069,7 +6066,7 @@ gbFileTime gb_file_last_write_time(char const *filepath) {
gb_inline b32 gb_file_copy(char const *existing_filename, char const *new_filename, b32 fail_if_exists) {
#if defined(GB_SYSTEM_OSX)
return copyfile(existing_filename, new_filename, NULL, COPYFILE_DATA) == 0;
#else
#elif defined(GB_SYSTEM_LINUX) || defined(GB_SYSTEM_FREEBSD)
isize size;
int existing_fd = open(existing_filename, O_RDONLY, 0);
int new_fd = open(new_filename, O_WRONLY|O_CREAT, 0666);
@@ -6085,6 +6082,49 @@ gb_inline b32 gb_file_copy(char const *existing_filename, char const *new_filena
close(new_fd);
close(existing_fd);
return size == stat_existing.st_size;
#else
int new_flags = O_WRONLY | O_CREAT;
if (fail_if_exists) {
new_flags |= O_EXCL;
}
int existing_fd = open(existing_filename, O_RDONLY, 0);
int new_fd = open(new_filename, new_flags, 0666);
struct stat stat_existing;
if (fstat(existing_fd, &stat_existing) == -1) {
return 0;
}
size_t bsize = stat_existing.st_blksize > BUFSIZ ? stat_existing.st_blksize : BUFSIZ;
char *buf = (char *)malloc(bsize);
if (buf == NULL) {
close(new_fd);
close(existing_fd);
return 0;
}
isize size = 0;
ssize_t nread, nwrite, offset;
while ((nread = read(existing_fd, buf, bsize)) != -1 && nread != 0) {
for (offset = 0; nread; nread -= nwrite, offset += nwrite) {
if ((nwrite = write(new_fd, buf + offset, nread)) == -1 || nwrite == 0) {
free(buf);
close(new_fd);
close(existing_fd);
return 0;
}
size += nwrite;
}
}
free(buf);
close(new_fd);
close(existing_fd);
if (nread == -1) {
return 0;
}
return size == stat_existing.st_size;
#endif
}